PROLUBE 44842 Heavy Duty Grease Gun Holder. Designed especially for use on farm and construction equipment. Great for trailers, tractors, and other automobiles in high vibration environments. For holding grease guns with a standard 2.25-inch (57 mm) barrel diameter. Up to 2.5-inch (63.5 mm) barrels as well. The grease holder can hold many other tools. All-steel construction makes the holder sturdy. The 4-Bolt design ensures the holder will mount fixed and steady. Having set standards of excellence for ourselves, the constant quest is on bettering them. Stringent systems and processes are constantly monitored to ensure conformance and consistency at all stages of production. All our processes comply with the ISO 9001 Quality System Standard.